Fundraising Fox

Calibrate

10 known investors

Calibrate offers a Metabolic Reset weight-loss program that combines GLP-1 medications prescribed by clinicians with lifestyle coaching to help members lose weight and maintain it. It sells to individuals and to employers and organizations seeking obesity care benefits.

Also known as Calibrate Health

Investors Β· 10

Also in the syndicate Β· 1

Tiger Globallead

Funding

SEC filings, press & company announcements

Source: company announcements and press reports β€” follow each round's link for the claim.

Company profile

researched Aug 2026

Calibrate is a telehealth weight-loss company whose core offering is a program it calls the Metabolic Reset, built around clinician-prescribed GLP-1 and GIP/GLP-1 medications (including tirzepatide, semaglutide and dulaglutide, marketed under names such as Zepbound, Wegovy, Ozempic, Mounjaro and Foundayo) combined with 1:1 video coaching and a science-based reading curriculum delivered through the Calibrate app. Onboarding runs through an eligibility quiz, a comprehensive health intake form, an initial coaching session, lab blood work, and a first virtual appointment with a Calibrate clinician within roughly the first two weeks. The program is then structured into stages over the first year β€” learning (months 0-3), practicing (3-6), setting and reinforcing (6-9), and sustaining (9+) β€” with biweekly coaching sessions, biweekly goals, and one to two lessons per week covering food, exercise, sleep and emotional health. Members must commit for a minimum of three months and can cancel penalty-free after that if the program is not working for them.

The company frames obesity as a matter of underlying metabolic biology rather than willpower or calorie restriction, and positions its curriculum and coaching as differentiating it from providers that only supply prescriptions. Calibrate also operates an insurance-navigation team to help members obtain an initial GLP-1 prescription at a stated typical cost of about $25 per month or less after any deductible, and has described a proprietary integrated vertical pharmacy engine to help members access drugs such as Wegovy. Eligibility criteria for employer-sponsored members include being at least 18 years old, enrollment in the company group health plan, and a BMI of 30 or above, or 27 or above with one or more metabolic conditions.

Calibrate launched in 2020, raised roughly $127 million by the end of 2021 including a $100 million Series B, and then encountered operational difficulties: it was unable to raise further equity in 2022, borrowed from Madryn Asset Management beginning in November 2022, defaulted on loan terms at least once in 2023, and in October 2023 executed a restructuring in which Madryn exchanged $20 million of its loans for a 70% senior equity stake. Founder and CEO Isabelle Kenyon stepped down as part of that restructuring.

Founding story

Calibrate was launched in 2020 by founder and CEO Isabelle Kenyon, who framed its first year as proving that investing in preventative care produces measurable outcomes, and its mission as addressing the stigma around obesity, which the American Medical Association categorised as a chronic disease in 2014.

Business model

Calibrate sells a subscription membership that bundles clinician care, prescription GLP-1 medication management, 1:1 coaching and an educational curriculum. It runs both a direct-to-consumer channel, with memberships advertised from $199 per month and monthly payment options, and an enterprise channel in which employers cover the cost of the program for employees and their dependents enrolled in the company group health plan. Medication itself is obtained through insurance with the help of Calibrate's insurance-navigation team.

Recurring monthly membership fees starting at $199 per month paid by individual consumers, plus employer-funded coverage of the program for employees and dependents. Direct-to-consumer revenue has been materially affected by refunds; in March 2023 refunds of nearly $2.6 million consumed almost 60% of that month's direct-to-consumer sales.

Traction

Calibrate reports average member weight loss of 16% of body weight at 12 months, 18% at 24 months and 20% at 36 months per its Results Report, and states that eight out of ten members find it more effective than other programs they have tried, with a 4.5 average rating across 1,618 reviews. At the time of its 2021 Series B the company reported an average annual body weight loss of 14% against a 10% goal. It says it has helped tens of thousands of members access affordable GLP-1s. In 2023 the company issued large member refunds and reduced headcount, with more than a dozen health coaches indicating departures in October 2023.

Latest developments

The October 2023 restructuring transferred majority ownership to Madryn Asset Management and led to the departure of founder-CEO Isabelle Kenyon and staff reductions, including health coaches. The consumer program continues to be marketed with memberships from $199 per month, monthly payment flexibility, an employer coverage channel, and prescribing of medications including Zepbound, Wegovy and Foundayo.

β–ΈFull profile β€” market position, technology, go-to-market, geography, history, risks & controversies

Market position

Calibrate was among the first companies built specifically to prescribe the newer GLP-1 weight-loss drugs and, at its 2021 Series B, its CEO claimed it was the only business in the sector focused on biology. Its position has since been pressured by numerous other startups racing into online weight-loss drug prescribing, and by the 2023 restructuring under Madryn Asset Management.

The company emphasises a metabolic rather than calorie-restriction framing of weight loss and positions itself as more than a prescription provider by pairing FDA-approved GLP-1 medication with structured 1:1 video coaching and a multi-month educational curriculum, and by offering insurance navigation to lower medication cost. It publishes a clinically-reviewed Results Report on member outcomes.

Technology

A member-facing mobile app delivering the curriculum, goal setting, coaching sessions and progress tracking, virtual clinician visits, remote lab ordering, and what the company has described as a proprietary integrated vertical pharmacy engine used to help members obtain GLP-1 medications.

Go-to-market

Two channels: a self-serve consumer signup funnel on joincalibrate.com beginning with an eligibility quiz, and an employer channel where prospective members search whether their employer covers Calibrate. The company said in 2021 that it intended to build out its enterprise business alongside its established consumer business.

Adults aged 18 and over with a BMI of 30 or higher, or 27 or higher with a metabolic condition such as pre-diabetes, who are seeking sustained weight loss; and employers and health plans purchasing obesity and metabolic health benefits for employees and dependents.

Geography

United States; the company's market framing and CDC obesity statistics cited at its Series B refer to the U.S.

History

Launched in 2020, Calibrate raised a $100 million Series B in August 2021 co-led by Founders Fund and Tiger Global with participation from Optum Ventures and existing investors, bringing cumulative funding to $127.6 million; Founders Fund partner Brian Singerman joined the board. Attempts to raise further equity in 2022 failed amid difficult equity markets and rising operating costs, and the board turned to debt, agreeing in November 2022 to borrow from Madryn Asset Management, which had lent $64 million by October 2023. After operational problems, a loan default and heavy refunds in 2023, Madryn in September 2023 presented a choice between restructuring and Chapter 11; Calibrate agreed to restructure on 12 September 2023 and the deal closed on 16 October 2023, with Madryn converting $20 million of loans into senior equity for a 70% stake. Founder Isabelle Kenyon stepped down as CEO and retained a 2.5% stake, existing equityholders were converted into Class C shares totalling 15% of the company, holders of certain convertible instruments received Class B shares totalling another 15%, and Founders Fund and Tiger Global were each left with about 1%.

Risks & controversies

During 2023 Calibrate faced extensive member complaints over delays in obtaining weight-loss medications and slow responses to member messages, paid out large refunds (nearly $2.6 million in March 2023 alone, about 60% of that month's direct-to-consumer sales), and defaulted at least once on its loans from Madryn. Some long-term patients reportedly regained much of the weight they had lost after the company failed to obtain their medications. An acquisition process with a large healthcare company in summer 2023 did not complete. Madryn retains the ability to force a bankruptcy filing in certain circumstances and holds a first-payout right entitling it to twice its $20 million equity investment before other investors recover anything. Competition from numerous other online GLP-1 prescribers is intense.

Compiled by commissioned research from 8 cited public sources β€” announcements, filings, and press listed under research sources below.

Key figures

latest reported
Average member body weight loss at 12 monthsJan 2025$16
Average member body weight loss at 24 monthsJan 2025$18
Average member body weight loss at 36 monthsJan 2025$20
Average member ratingJan 20254.5 out of 5 (1,618 reviews)
Cumulative funding raisedAug 2021$127.6M
Founder Isabelle Kenyon ownership stake after restructuringOct 20232.5%
Founders Fund ownership stake after restructuringOct 20231 % (approximate)
Madryn ownership stake after restructuringOct 202370%
Membership priceJan 2025$199
Refunds paid to membersMar 2023$2.6M
Reported average annual member body weight lossAug 2021$14
Tiger Global ownership stake after restructuringOct 20231 % (approximate)
Total capital raised from investors (per Pitchbook, including some Madryn lendinNov 2023$170M
Total lent to Calibrate by Madryn Asset ManagementOct 2023$64M
Typical member out-of-pocket cost for initial GLP-1 prescriptionJan 2025$25

Company-reported or press-reported figures, each dated to when it was claimed β€” not independently audited.

Timeline Β· 8

launches, deals, and filings
Oct 2023
Madryn Asset Management takes 70% stake in restructuring

The restructuring was executed on October 16, 2023: Madryn exchanged $20 million of its loans for senior equity representing a 70% stake. Existing equityholders were converted into Class C shares totalling 15% of the company and certain convertible holders into Class B shares totalling 15%. Madryn is entitled to $40 million β€” twice its equity investment β€” ahead of other investors if Calibrate is sold or folds, and can still force a bankruptcy filing in certain circumstances.

$20M source β†—

Oct 2023
Founder Isabelle Kenyon steps down as CEO

Calibrate founder Isabelle Kenyon stepped down as CEO as part of the October 2023 restructuring, retaining a 2.5% stake.

source β†—

Oct 2023
Staff reductions reported

In late October 2023 more than a dozen Calibrate health coaches posted that they were seeking new roles or had left the company, indicating headcount cuts.

source β†—

Sep 2023
Calibrate agrees to restructuring after Madryn ultimatum

In September 2023 Madryn offered Calibrate a choice of restructuring with Madryn taking majority ownership or filing for Chapter 11 bankruptcy; Calibrate agreed to restructure on September 12, 2023.

source β†—

Nov 2022
Debt financing agreement with Madryn Asset Management

After being unable to raise additional equity in 2022 due to difficult equity markets and increased operating costs, Calibrate's board reached a deal in November 2022 to borrow from private equity firm Madryn Asset Management; Madryn had lent $64 million by October 2023.

$64M source β†—

Aug 2021
Calibrate raises $100M Series B co-led by Founders Fund and Tiger Global

Calibrate announced a $100 million Series B round co-led by new investors Founders Fund and Tiger Global, with participation from Optum Ventures and existing investors, bringing cumulative funding to $127.6 million. The company said it would use the capital to build out its enterprise business alongside its consumer business.

$100M source β†—

Aug 2021
Founders Fund partner Brian Singerman joins board of directors

As part of the Series B, Founders Fund partner Brian Singerman joined Calibrate's board of directors.

source β†—

Aug 2021
Expanded member access to Wegovy via vertical pharmacy engine

Calibrate expanded consumer access to newly FDA-approved weight-loss medications including Novo Nordisk's Wegovy, using what it described as a proprietary integrated vertical pharmacy engine.

source β†—

Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.

In the news

β–ΈResearch sources Β· 8

primary sources listed

8 public sources were cited for this profile; the first-party ones are listed here.

Frequently asked questions

What does Calibrate do?
Telehealth company offering a GLP-1-based metabolic weight-loss program combining prescribed medication with 1:1 coaching.
Who are Calibrate's investors?
Calibrate's investors include Declaration Partners, Optum Ventures, PLUS Capital, Samsung Next, Threshold Ventures, Forerunner Ventures, Founders Fund, Redesign Health and 1 more.